not able to connect mysql server

http://serverfault.com –
I have mistakenly deleted some of the dependent file for mysql when I am trying to use mysql command i am getting following error :
ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2)
I have tried reinstalling mysql-server but it still not resolved .
What should I do to bring back everything to normal condition.
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